feat: agent builder, CWD support, auto-save, UI polish, unavailable tool handling

- Agent Builder: full CRUD with card grid, drag-and-drop model reorder, edit/delete
- Auto-save on edit with 600ms debounce, AbortController for concurrency, fieldset disabled until name entered
- Agent definitions stored as TOML with cwd field, loaded from global/project dirs
- Working directory: per-tab CWD override in Chat Settings, agent default CWD, auto-create on first message
- CWD validation: check-dir endpoint with ~ expansion, real-time validity indicator
- Subagent CWD validated against parent's effective CWD using path.relative
- Unavailable tool calls: caught gracefully, shown as tool call with error badge, model retries
- UI: tab bar border radius, sidebar border removed, chat input ghost style, scroll-to-bottom rectangle
- Skills dir collapse uses CSS rotation, Model Choice renamed to Chat Settings, System Prompt view removed
- Reusable SkillsBrowser/ToolPermissions with external mode for Agent Builder
- ModelSelector: Agent/Manual toggle, agent list, Agent Settings link
- Page router, skills recursive scanning, bin/up gopass removed, docker volume mounts

1 files changed, 7 insertions, 4 deletions

diff --git a/packages/core/src/llm/provider.ts b/packages/core/src/llm/provider.ts
index 3131b1a..7cbb829 100644
--- a/packages/core/src/llm/provider.ts
+++ b/packages/core/src/llm/provider.ts
@@ -1,7 +1,7 @@
-import { createOpenAICompatible } from "@ai-sdk/openai-compatible";
 import { createAnthropic } from "@ai-sdk/anthropic";
-import { wrapLanguageModel } from "ai";
+import { createOpenAICompatible } from "@ai-sdk/openai-compatible";
 import type { LanguageModelV1Middleware, LanguageModelV1Prompt } from "ai";
+import { wrapLanguageModel } from "ai";
 
 function normalizeMessages(msgs: unknown[]): unknown[] {
 	return msgs.map((msg: unknown) => {
@@ -19,7 +19,10 @@ function normalizeMessages(msgs: unknown[]): unknown[] {
 		);
 
 		const existingMetadata = (message.providerMetadata ?? {}) as Record<string, unknown>;
-		const existingOpenAICompat = (existingMetadata.openaiCompatible ?? {}) as Record<string, unknown>;
+		const existingOpenAICompat = (existingMetadata.openaiCompatible ?? {}) as Record<
+			string,
+			unknown
+		>;
 
 		return {
 			...message,
@@ -120,4 +123,4 @@ function createAnthropicProvider(config: ProviderConfig) {
 	};
 }
 
-export { prefixToolName, unprefixToolName };
\ No newline at end of file
+export { prefixToolName, unprefixToolName };